Client: Parsons/AECOM JV
Owner: San Francisco Public Utilities Commission (SFPUC)
Location: San Francisco Bay Area
As part of the Program Management team, JCK Underground is providing technical support of the CBSIP 35% design effort. JCK Underground’s scope of services include: offering a Lessons Learned Workshop on Planning, Design, and Construction of Underground Facilities to the CBSIP design team; participating in the Technical Advisory Panel (TAP) Workshop; providing independent constructability reviews, structural and geotechnical design consultation and peer reviews; and performing independent reviews of the construction schedule and cost estimate.
The project includes a 110-foot (33.5-m) diameter by 183-foot (55.6-m) deep shaft that will house the 120-mgd (454-megaliters/day) CBS at the downstream end. The Central Bayside Pump (Lift) Station (CBS) shaft will be used to launch the TBM and support operations to drive and construct the Channel Tunnel (CHTL), a 1.7-mile (2.7-km) by 24-foot (7.3-m) ID concrete lined gravity conveyance/storage tunnel. The CHTL will be constructed approximately 135-feet to 150-feet (41.1-m to 45.7-m) below the ground surface and primarily within the Franciscan Formation (rock). The TBM will terminate its drive at the 45-foot (13.7-m) diameter by 140-foot (42.7-m) deep Retrieval Shaft located on Parcel P7. Once built-out and in operation, this shaft will drop dry and wet weather flows into the CHTL. A 24-foot (7.3-m) diameter Intertie Shaft will also be constructed, that will drop dry and wet weather flows into the CHTL from the Islais Creek Transport/Storage Box, and will also serve as primary access into the CHTL for future inspections and maintenance.